Unit 3.3: Photosynthesis

Question 1

Where does photosynthesis take place in plant cells?

Answer 1

The chloroplasts

Question 2

What’s the word equation of photosynthesis?

Answer 2

Carbon dioxide + Water –light energy and chlorophyll–> Glucose + Oxygen

Question 3

What are the 2 stages of photosynthesis?

Answer 3

Stage 1: Light dependent stage

Stage 2: Carbon fixation

Question 4

What is the purpose of chlorophyll?

Answer 4

To trap light energy from the sun in the light reaction

Question 5

Describe the energy conversion that occurs during the light reaction.

Answer 5

The light energy is converted from light energy to chemical energy

Question 6

Name the substance that is generated from the chemical energy.

Answer 6

ATP

Question 7

Describe what happens to water during the light reaction.

Answer 7

It splits into hydrogen and oxygen

Question 8

Describe the fate of the oxygen.

Answer 8

It gets diffuses out of the cell

Question 9

Describe what happens to the H2 and ATP.

Answer 9

They go to stage 2

Question 10

How is carbon fixation controlled?

Answer 10

By enzymes

Question 11

What happens during carbon fixation?

Answer 11

H2 and CO2 get joined together using ATP to produce glucose (sugar)

Question 12

State the 3 fates of the chemical energy in sugar.

Answer 12

Gets stored as starch
Is used for respiration
Gets converted into cellulose

Question 13

What is the function of starch in a plant cell?

Answer 13

A storage carbohydrate

Question 14

What is used to test for starch?

Answer 14

Iodine

Question 15

State the function of cellulose in a plant cell.

Answer 15

For structure in a cell wall

Question 16

Describe what is meant by the limiting factor.

Answer 16

The factor the reaction lacks

Question 17

Name 3 limiting factors for photosynthesis.

Answer 17

Temperature
Light intensity
Carbon concentration

Question 18

What happens to plants if all factors are not at their optimum?

Answer 18

They grow slowly